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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package org.jboss.netty.channel.socket.nio;

import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelState;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;

import java.net.ConnectException;
import java.net.SocketAddress;
import java.nio.channels.ClosedChannelException;

import static org.jboss.netty.channel.Channels.*;

class NioClientSocketPipelineSink extends AbstractNioChannelSink {

    static final InternalLogger logger =
        InternalLoggerFactory.getInstance(NioClientSocketPipelineSink.class);

    private final BossPool bossPool;

    NioClientSocketPipelineSink(BossPool bossPool) {
        this.bossPool = bossPool;
    }

    public void eventSunk(
            ChannelPipeline pipeline, ChannelEvent e) throws Exception {
        if (e instanceof ChannelStateEvent) {
            ChannelStateEvent event = (ChannelStateEvent) e;
            NioClientSocketChannel channel =
                (NioClientSocketChannel) event.getChannel();
            ChannelFuture future = event.getFuture();
            ChannelState state = event.getState();
            Object value = event.getValue();

            switch (state) {
            case OPEN:
                if (Boolean.FALSE.equals(value)) {
                    channel.worker.close(channel, future);
                }
                break;
            case BOUND:
                if (value != null) {
                    bind(channel, future, (SocketAddress) value);
                } else {
                    channel.worker.close(channel, future);
                }
                break;
            case CONNECTED:
                if (value != null) {
                    connect(channel, future, (SocketAddress) value);
                } else {
                    channel.worker.close(channel, future);
                }
                break;
            case INTEREST_OPS:
                channel.worker.setInterestOps(channel, future, ((Integer) value).intValue());
                break;
            }
        } else if (e instanceof MessageEvent) {
            MessageEvent event = (MessageEvent) e;
            NioSocketChannel channel = (NioSocketChannel) event.getChannel();
            boolean offered = channel.writeBufferQueue.offer(event);
            assert offered;
            channel.worker.writeFromUserCode(channel);
        }
    }

    private static void bind(
            NioClientSocketChannel channel, ChannelFuture future,
            SocketAddress localAddress) {
        try {
            channel.channel.socket().bind(localAddress);
            channel.boundManually = true;
            channel.setBound();
            future.setSuccess();
            fireChannelBound(channel, channel.getLocalAddress());
        } catch (Throwable t) {
            future.setFailure(t);
            fireExceptionCaught(channel, t);
        }
    }

    private void connect(
            final NioClientSocketChannel channel, final ChannelFuture cf,
            SocketAddress remoteAddress) {
        channel.requestedRemoteAddress = remoteAddress;
        try {
            if (channel.channel.connect(remoteAddress)) {
                channel.worker.register(channel, cf);
            } else {
                channel.getCloseFuture().addListener(new ChannelFutureListener() {
                    public void operationComplete(ChannelFuture f)
                            throws Exception {
                        if (!cf.isDone()) {
                            cf.setFailure(new ClosedChannelException());
                        }
                    }
                });
                cf.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
                channel.connectFuture = cf;
                nextBoss().register(channel, cf);
            }

        } catch (Throwable t) {
            if (t instanceof ConnectException) {
                Throwable newT = new ConnectException(t.getMessage() + ": " + remoteAddress);
                newT.setStackTrace(t.getStackTrace());
                t = newT;
            }
            cf.setFailure(t);
            fireExceptionCaught(channel, t);
            channel.worker.close(channel, succeededFuture(channel));
        }
    }

    private NioClientBoss nextBoss() {
        return bossPool.nextBoss();
    }

}